The effect of nitrogen on crystallisation products of Y and Er- SiAlON glasses

E. Dolekcekic, M. J. Pomeroy, S. Hampshire

Research output: Contribution to journalConference articlepeer-review

Abstract

MSiAlON glasses with compositions of M:Si:Al = 3.45:3:2 (M= Y, Er) and varying nitrogen contents (N=5, 8, 15, and 22 equivalent %) were produced by melting appropriate powder J mixtures under nitrogen at 1715°C. Glass-ceramics were obtained by heat treatment of the glasses for 10 hours under a nitrogen atmosphere in the range 950-1200°C. From previous investigations, these compositions are expected to produce either B-phase (M3SiAlO5N) or Iw-phase (M3Si 2Al1(O,N10) (i.e. 10 e/o N) (M= Y, Er) after heat treatment, depending on N content and temperature. Parent glasses and the resulting glass-ceramics were characterised by X-ray diffraction (XRD). The results showed that with low nitrogen containing starting compositions, it is possible to obtain XRD patterns which appear to have similar peak positions to B-phase at lower temperatures (e.g. 975 - 1025°C). However, more detailed investigations show that the peak positions in the pattern obtained do not quite coincide with the original B-phase and the phase formed has a contraction in the a dimension and an elongation in the c dimension. Crystallographic calculations show that this phase has a hexagonal unit cell with parameters of a = 3.77-3.82 Å and c = 9.83-9.97 Å. These parameters are functions of the nitrogen content of the B-phase.

Original languageEnglish
Pages (from-to)1863-1866
Number of pages4
JournalKey Engineering Materials
Volume264-268
Issue numberIII
DOIs
Publication statusPublished - 2004
EventProceedings of the 8th Conference and Exhibition of the European Ceramic Society - Istanbul, Turkey
Duration: 29 Jun 20033 Jul 2003

Keywords

  • B-phase
  • Crystallisation
  • Sialon Glasses
  • X-Ray diffraction

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